Tod River (reservoir)

Tod Reservoir
Location South Australia
Coordinates 34°28′55″S 135°50′49″E / 34.482°S 135.847°E / -34.482; 135.847Coordinates: 34°28′55″S 135°50′49″E / 34.482°S 135.847°E / -34.482; 135.847
Construction began 1918
Opening date 1922
Dam and spillways
Height 25 m
Length 351 m
Reservoir
Total capacity 11 300 ML
Catchment area Tod River & Pillaworta Creek
Surface area 134 ha

The Tod River is the only stream on Eyre Peninsula, South Australia providing reliable flows. The Tod reservoir is situated 27 km north of Port Lincoln and is supplied by concrete channels fed from weirs constructed across the Tod River and its major tributary, Pillaworta Creek.[1] The river was named after Mr Robert Tod who discovered it during explorations in 1839.[2] The Tod River flows into Louth Bay on Spencer Gulf.

Tod River Reservoir Museum & Picnic Area

A museum which features audio and visual displays is located off White Flat Road, northwest of Poonindie. Grounds include a playground, tennis court, coin-operated barbecues and a picnic area. Grounds are open 7 days. The museum is open Monday to Friday, from 9am to 4pm.[3][4]

Reservoir Status

The catchment yield for the Tod River is estimated to be 11 gigalitres per annum., though this can reduce significantly during periods of drought.[5]

While for some years up to 3,000 ML/year of water was extracted from the reservoir for potable use, negligible water has been extracted since 2001-2002. Reasons for the change include increasing salinity and concerns about the levels of agricultural chemicals in the reservoir. The reservoir has been retained as a ‘contingency' water supply measure since that time.[1][6]

In April 2011, the Department for Water listed three possible options for the future use of the Tod Reservoir. They were:[5]

  1. Catchment rehabilitation to improve the health of the Tod Reservoir and the quality of its inflows
  2. Potential recreational use
  3. Decommissioning and removing the dam wall

There is widespread support in the Eyre Peninsula community for recommissioning the Tod Reservoir using desalination.

SA Water investigated this option and concluded it was not viable because of the difficulty in finding an environmentally suitable location for brine waste disposal. SA Water also concluded there was insufficient volume of water available in the reservoir to justify desalination. Alternative views exist, with others suggesting that desalination could be viable with some further engineering and catchment management considerations.[6]

In 2013, the reservoir's future has been the topic of Parliamentary debate, including speculation over its future use by iron ore mining company, Centrex Metals Ltd.[7]

In September 2014, the Port Lincoln Times reported that the Tod River Reservoir would be opened to recreational fishing and would be stocked with "recreationally attractive species." The change was expected to occur within the 2014-2015 financial year.[8]

Reservoir Construction

Mr C. A. Bayer presented the merits of a dam on the Tod River to the Royal Commission in 1916.[2] An earth embankment dam was built on the Tod River between 1918 and 1922 at a cost of $562,000.[1] In late 1918, three men were killed in a cave-in. Another four died in two separate blasting accidents in 1921.[1] In 1921, 600 men were employed on the project.[9] The reservoir overflowed for the first time in August 1932.[10]

A memorial to all seven men killed during the reservoir's construction was erected at the picnic area near the embankment in 1982.[1]

Reservoir statistics

Capacity: 11,300 megalitres

Length of wall: 351m

Height of wall: 25m

Type of wall: Earth with clay core

Area of water spread: 134 hectares[1]

See also

References

  1. 1 2 3 4 5 6 SA Water - Community and Education - Our Water Systems Retrieved 2013-12-07.
  2. 1 2 Trove "Tod River Reservoir - A Triumph of Engineering" Port Lincoln Times, Friday 7 February 1930.
  3. ↑ "Tod River Reservoir Museum & Picnic Area" SACommunity.org Retrieved 2013-12-07.
  4. ↑ "Tod River Reservoir". District Council of Tumby Bay. Retrieved 15 July 2015.
  5. 1 2 Eyre Peninsula Demand & Supply Statement. Adelaide, South Australia: Government of South Australia, Department for Water. 2011. pp. 23, 34.
  6. 1 2 "Eyre Peninsula Water Supply Final Report 85th Report of the Natural Resources Committee - Under the lens" Parliament South Australia (2013)
  7. ↑ "The Future of the Tod Reservoir" Port Lincoln Residents & Ratepayers Association Retrieved 2013-12-07.
  8. ↑ Harrison, Billie. "Plan to fish in the Tod". Retrieved 2015-06-20.
  9. ↑ Trove "Three Excavators Killed at Tod River Reservoir" Barrier Miner Friday 9 December 1921
  10. ↑ Trove "Tod River Reservoir Overflowing" News Thursday 11 August 1932
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